I don't think it's unusual that you would take on some of your best friends attributes--she was your best for a long time; she was a good role model. Thank her and live it.

It's okay to be happy after her death; I believe she'd want that--so stop your inner dialogue of guilt. What is--is. And unfortunately, your friend died, and you are alive. Nothing will change that--but living a happy life will be a testament to the friendship you two once had.

Live it. It's okay...